<div dir="ltr"><div class="" style=""><p style="margin:0px 0px 1.2em!important">Hi Brain, </p>
<p style="margin:0px 0px 1.2em!important">>I don’t know much about the Swift bug. A BUG() or crash in the kernel is generally always a kernel bug, regardless of what userspace is doing. It >certainly could be that whatever userspace is doing to trigger the kernel bug is a bug in the userspace application, but either way it shouldn’t cause the >kernel to crash. By the same token, if Swift is updated to fix the aforementioned bug and the kernel crash no longer reproduces, that doesn’t >necessarily mean the kernel bug is fixed (just potentially hidden).</p><p style="margin:0px 0px 1.2em!important">Understand. </p>
<p style="margin:0px 0px 1.2em!important">[Previous Message]</p>
<pre style="font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;background-color:rgb(248,248,248)">The valid inode has an inode number of 13668207561.
- The fsname for this inode is "sdb."
- The inode does appear to have a non-NULL if_data:

    if_u1 = {
      if_extents = 0xffff88084feaf5c0,
      if_ext_irec = 0xffff88084feaf5c0,
      if_data = 0xffff88084feaf5c0 "\004"
    },

        find <mntpath> -inum 13668207561
</code></pre><p style="margin:0px 0px 1.2em!important">Q1: Were you able to track down the directory inode mentioned in the previous message?</p>
<p style="margin:0px 0px 1.2em!important">Ans: Yes, it’s the directory/file as below. /srv/node/d224 is the mount point of /dev/sdb . This is the original location of the path. This folder includes the file 1436266052.71893.ts now. The .ts file is 0 size </p>
<pre style="font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;background-color:rgb(248,248,248)">
[root@r2obj01 ~]# find /srv/node/d224 -inum 13668207561
/srv/node/d224/objects/45382/b32/b146865bf8034bfc42570b747c341b32

[root@r2obj01 ~]# ls -lrt /srv/node/d224/objects/45382/b32/b146865bf8034bfc42570b747c341b32
-rw------- 1 swift swift 0 Jul 7 22:37 1436266052.71893.ts
</code></pre><p style="margin:0px 0px 1.2em!important">Q2: Is it some kind of internal directory used by the application (e.g., perhaps related to the quarantine mechanism mentioned in the bug)?</p>
<p style="margin:0px 0px 1.2em!important">Ans: Yes, it’s a directory which accessing by application. </p>
<pre style="font-family:Consolas,Inconsolata,Courier,monospace;font-size:1em;line-height:1.2em;margin:1.2em 0px"><code style="font-size:0.85em;font-family:Consolas,Inconsolata,Courier,monospace;margin:0px 0.15em;white-space:pre;overflow:auto;border-radius:3px;border:1px solid rgb(204,204,204);padding:0.5em 0.7em;display:block!important;background-color:rgb(248,248,248)">
 37 ffff8810718343c0 ffff88105b9d32c0 ffff8808745aa5e8 REG  [eventpoll]
 38 ffff8808713da780 ffff880010c9a900 ffff88096368a188 REG /srv/node/d224/quarantined/objects/b146865bf8034bfc42570b747c341b32/1436266042.57775.ts
 39 ffff880871cb03c0 ffff880495a8b380 ffff8808a5e6c988 REG  /srv/node/d224/tmp/tmpSpnrHg

 40 ffff8808715b4540 ffff8804819c58c0 ffff8802381f8d88 DIR  /srv/node/d224/quarantined/objects/b146865bf8034bfc42570b747c341b32
</code></pre><p style="margin:0px 0px 1.2em!important">The above operation in the swift-object-server was doing python function call to rename the file<i> /srv/node/d224/objects/45382/b32/b146865bf8034bfc42570b747c341b32/1436266042.57775.ts</i> as <i>/srv/node/d224/quarantined/objects/b146865bf8034bfc42570b747c341b32/1436266042.57775.ts</i></p>
<p style="margin:0px 0px 1.2em!important"></p><div class=""><p></p><blockquote style="margin:0px 0px 0px 40px;border:none;padding:0px"><div><div><div><span style="color:rgb(51,51,51);font-family:Consolas,'Liberation Mono',Menlo,Courier,monospace;font-size:12px;line-height:16.7999992370605px;white-space:pre">os.rename(old, new)</span></div></div></div></blockquote><p></p></div><p style="margin:0px 0px 1.2em!important"></p>
<p style="margin:0px 0px 1.2em!important">And it crashed at this point. In the Q1, we found the inum is pointing to the directory <span style="font-family:Consolas,Inconsolata,Courier,monospace;font-size:12px;line-height:15.6000003814697px;white-space:pre;background-color:rgb(248,248,248)">/srv/node/d224/objects/45382/b32/b146865bf8034bfc42570b747c341b32</span> . </p><p style="margin:0px 0px 1.2em!important">We found that multiple(over 10) DELETE from application against the target file at almost same moment. The DELETE is removing the original file in the directory and create new empty .ts file in this directory. I suspect that multiple os.rename on the same file in that directory will cause the kernel panic. </p><p style="margin:0px 0px 1.2em!important">And the file /srv/node/d224/quarantined/objects/b146865bf8034bfc42570b747c341b32/1436266042.57775.ts was not created.<br></p><p style="margin:0px 0px 1.2em!important">Regards // Hugo </p>
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